BaseAdapter的优化

传统的

package cct.commonadapter.bean;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
import cct.commonadapter.R;

public class MyAdapter extends BaseAdapter {
    private LayoutInflater inflater;
    private List<Message> mdata;
    public MyAdapter(Context context,List<Message> mdata){
         inflater=LayoutInflater.from(context);
        this.mdata=mdata;
    }
    @Override
    public int getCount() {
        return mdata.size();
    }
    @Override
    public Object getItem(int position) {
        return mdata.get(position);
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolders holder;
        if(convertView==null){
            convertView=inflater.inflate(R.layout.item,parent,false);
            holder=new ViewHolders();
            holder.mtitle= (TextView) convertView.findViewById(R.id.mtitle);
            holder.mdesc= (TextView) convertView.findViewById(R.id.mdesc);
            holder.mtime= (TextView) convertView.findViewById(R.id.mtime);
            holder.mphone= (TextView) convertView.findViewById(R.id.mphone);
            convertView.setTag(holder);
        }
        else {
            holder = (ViewHolders) convertView.getTag();
        }
            Message ms = mdata.get(position);
            holder.mtitle.setText(ms.getTitle());
            holder.mdesc.setText(ms.getDesc());
            holder.mtime.setText(ms.getTime());
            holder.mphone.setText(ms.getPhone());

        return convertView;
    }
    private  class ViewHolders
    {
        TextView mtitle;
        TextView mdesc;
        TextView mtime;
        TextView mphone;
    }
}

 附上Msessage类

    public class Message {
    private String title;
    private String desc;
    private String time;
    private String phone;
    public Message(int position) {
    }
    public Message(String title, String desc, String time, String phone) {
        this.title = title;
        this.desc = desc;
        this.time = time;
        this.phone = phone;
    }
    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

}

万能适配器

//CommonAdapter
 1 package cct.commonadapter.adapterUtil;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import java.util.List;
import cct.commonadapter.R;

public  abstract class CommonAapter<T> extends BaseAdapter {
    protected Context context;
    protected LayoutInflater inflater;
    protected List<T> mdata;

    public CommonAapter(Context context, List<T> mdata) {
        this.context=context;
        inflater=LayoutInflater.from(context);
        this.mdata=mdata;
    }
    @Override
    public int getCount() {
        return mdata.size();
    }

    @Override
    public T getItem(int position) {
        return mdata.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public  View getView(int position, View convertView, ViewGroup parent)
    {
        ViewHolder holder=ViewHolder.get(context,convertView,parent, R.layout.item,position);
        covert(holder,getItem(position));
        return holder.getMconvertView();
    }
    public abstract void covert(ViewHolder holder, T t) ;

}

 通用的Viewholder

package cct.commonadapter.adapterUtil;
import android.content.Context;
import android.graphics.Bitmap;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

public  class ViewHolder {
    private SparseArray<View> mViews;
    protected int mPosition;
    private View mConvertView;
    private Context mContext;
    protected int mLayoutId;

    /**初始化一个ViewHolder
     * @param context
     * @param itemView
     * @param parent
     * @param position
     */
    public ViewHolder(Context context, View itemView, ViewGroup parent, int position) {
        mContext = context;
        mConvertView = itemView;
        mPosition = position;
        mViews = new SparseArray<View>();
        mConvertView.setTag(this);
    }

    /**入口方法:用来判断页面是否加载过
     * @param context
     * @param convertView
     * @param parent
     * @param layoutId
     * @param position
     * @return
     */
    public static ViewHolder get(Context context, View convertView, ViewGroup parent, int layoutId, int position) {
       if (convertView == null)
        {
            View itemView = LayoutInflater.from(context).inflate(layoutId, parent,
                    false);
            ViewHolder holder = new ViewHolder(context, itemView, parent, position);
            holder.mLayoutId = layoutId;
            return holder;
        } else
        {
            ViewHolder holder = (ViewHolder) convertView.getTag();
            holder.mPosition = position;
            return holder;
        }
    }
    public View getMconvertView() {
        return mConvertView;
    }

    /**
     * 通过viewId获取View
     * @param viewId
     * @param <T>
     * @return
     */
    public <T extends View>T getView(int viewId){
        View view=mview.get(viewId);
        if(view==null)
        {view=mconvertView.findViewById(viewId);
            mview.put(viewId,view);
        }
        return (T)view;
    }
    public int getLayoutId()
    {
        return mLayoutId;
    }

    public void updatePosition(int position)
    {
        mPosition = position;
    }

    public int getItemPosition()
    {
        return mPosition;
    }

    /**通过得到控件id，和类的属性名
     * @param viewId
     * @param text
     * @return
     */
    public ViewHolder setTexts(int viewId,String text){
        TextView tv=getView(viewId);
        tv.setText(text);
        return this;
    }
    public ViewHolder setImageBitmap(int viewId, Bitmap map){
        ImageView iv=getView(viewId);
        iv.setImageBitmap(map);
        return this;
    }
    public ViewHolder setImageResource(int viewId, int resId)
    {
        ImageView view = getView(viewId);
        view.setImageResource(resId);
        return this;
    }
public ViewHolder setImageDrawable(int viewId, Drawable drawable)
    {
        ImageView view = getView(viewId);
        view.setImageDrawable(drawable);
        return this;
    }

    public ViewHolder setBackgroundColor(int viewId, int color)
    {
        View view = getView(viewId);
        view.setBackgroundColor(color);
        return this;
    }

    public ViewHolder setBackgroundRes(int viewId, int backgroundRes)
    {
        View view = getView(viewId);
        view.setBackgroundResource(backgroundRes);
        return this;
    }

    public ViewHolder setTextColor(int viewId, int textColor)
    {
        TextView view = getView(viewId);
        view.setTextColor(textColor);
        return this;
    }

    public ViewHolder setTextColorRes(int viewId, int textColorRes)
    {
        TextView view = getView(viewId);
        view.setTextColor(mContext.getResources().getColor(textColorRes));
        return this;
    }
}

任意一个适配器只需要继承上面封装好的适配器

package cct.commonadapter.bean;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
import cct.commonadapter.R;
import cct.commonadapter.adapterUtil.CommonAapter;
import cct.commonadapter.adapterUtil.ViewHolder;
import cct.commonadapter.bean.Message;

public class MyCommonAdapter extends CommonAapter<Message> {
    public MyCommonAdapter(Context context, List<Message> mdata){
        super(context,mdata);
    }

    @Override
    public void covert(ViewHolder holder, Message ms) {

        holder.setTexts(R.id.mtitle,ms.getTitle())
                .setTexts(R.id.mdesc,ms.getDesc())
                .setTexts(R.id.mtime,ms.getTime())
                .setTexts(R.id.mphone,ms.getPhone());
    }
}